Filler-cap for receptacles



C. F. BURROUGHS.

FILLER CAP FOR RECEPTACLES.

APHJCATION FILED JAN. 15. 1920.

1,346,877. Patented July 20, 1920.

I III 5] 0 MTOI/ a m/b n f r "7 g @5 61 050141 0 LA m UNITED STATES PATENT OFFICE.

CHARLES F. BURROUGHS, OF EAST ORANGE, NEW JERSEY, ASSIGNOR TO COMPOSITION MACHINERY CORPORATION, OF NEWARK, NEW JERSEY, A CORPORATION OF NEW JERSEY.

Specification of Letters Patent.

FILLER-CAP FOR RECEPTACLES.

Patented July 20, 1920.

Application filed January 15, 1920. Serial No. 351,697.

To all whom it may concern.-

Be it known that I, CHARLES F. BUR- noUGHs, a citizen of the United States, residing at 122 Prospect street, East Orange, county of Essex and State of New Jersey, have invented certain new and useful Improvements in Filler-Caps for Receptacles, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

The present inventionrelates to an improved screw-cap designed especially for receptacles whose contents are liable to corrode metal or plastic compositions like bakelite, which is more or less soluble in alcohol, but is otherwise a very desirable material.

This invention furnishes a means of using a bakelite cap upon the radiators of automobiles, in which alcohol is sometimes mixed with the water to prevent freezing; and upon other receptacles under analogous conditions.

The invention embraces a screw-cap of particular construction, and also a process of molding a .packing plate of vulcanized fiber or non-corrodible material or a plate of brass or analogous material into the top of a receptacle-cap, which plate of fiber or plate of brass bears upon the outlet orifice of the receptacle to which the cap is applied, Wholly excluding the liquid in the receptacle from contact with any portion of the cap.

The socket in the cap is threade as usual for retaining it upon the nozzle of the receptacle, and the disk or plate of packing material is locked permanently in the bottom of such socket bv forcing the plastic material in the molding operation to flow around the periphery of the packing-plate and thus overlap it.

Such result is secured by making the force, which presses the plastic material in the mold, of less diameter than the packing-plate, the cap being thus provided with a plate of non-corrodible packing material molded into the top of its socket and its edge extended into the wall of the socket so as to be locked permanently therein.

The packing plate, which acts as a stopper, may be made of any material which is non-corrodible in relation to the contents of the receptacle, and a cap with suitable stopper or packing plate may thus be used to close receptacles for acids, alkalis and other chemicals of corrosive character.

The process of manufacture which I employ forms a capwith a socket having a threaded wall, and the formation of the thread in the cap forms no part of my invention; but I have represented the thread formed directly in the wall of the'socket and also in a metal lining for such wall, which shows that it is immaterial how the thread is formed. The caps made both wa s are provided with the non-corrodible pac in -plate.

The invention will be understood by reference to the annexed drawing, in which Figure 1 is an outside view of the cap formed of bakelite; Fig. 2 is a plan of the same; Fig. 3 is a cross section of the same with threaded lining; Fig. 4: is a plan, and Fig. 5 anedge view of the lining apart from the body of the cap. Fig. 6 is a cross section of a mold charged with the plastic material in the form of a tablet, with the packing plate lying upon the same; Fig. 7 is a plan of the same; Fig. 8 is a perspective view of the tablet adapated to form the cap when properly molded; Fig. 9 is a cross section of a mold for the cap with a force to press the plastic material-therein; and 1Fig. 10 shows a cap screwed upon an outa designates the body of the cap which may be molded of any desired plastic material that may be softened by heat. b designates the screw-thread in the interior of the cap, by which it is secured upon the outlet-nozzle c of the receptacle d, as shown in Fig. 10.

e designates the stopper or packing plate of non-corrosive material secured within the top of the cap in the process of molding the same, the diameter of such plate being greater than that of the thread d, as shown in Fig. 9, so that its periphery extends under and beyond the thread and is thus held rigidly in the cap.

of the thread, by the expedient of laying a disk 6 of the suitable packing materlal upon the charge of plastic material or so-called tablet 7', within the bottom of the mold g.

Such mold is in practice heated when molding a cap, which softens the plastic material of the tablet f and permits a force h of suitable form to be pressed into the mold as shown in Fig. 9. Such force has a screwthread upon its periphery, and it o erates to force the plastic material against t e bottom of the mold and to crowd the edges of the tablet upward to form the sides of the cap with an internal screw-thread the 'force is made of lesser diameter than the packingplate, so that in pressing the plate upon the plastic material the periphery of the packing-plate projects around the working end of the force and the plastic material flows over such periphery and the periphery extends into the wall of the socket at the inner end of the thread, as is clearly shown in Fig. 9. The upward movement of the plastic material crowds it'past the edge of the packing-plate e and operates to lock the same permanently within the top of the cap. The mold is then cooled and the force withdrawn with the cap attached to its screw-thread, and the cap is then detached therefrom by unscrewing. The force performs a double function, as it molds the socket of the cap, and also presses the packing-plate into the plastic material so that the material rises around its periphery and overlaps it to lock it permanently in place.

Fig. 10 shows that the plate of packing material lettered e, which acts as a stopper to the outlet nozzle 0 which is required to contact only with the nozzle near the margin of the plate, and the center portion of the plate may therefore be concaved to lighten the cap, as shown in Figs. 3 and 9.

No brass lining is shown in the cap of Fig. 10, but such a lining 2' is shown in Fig. 3, and separately in Figs. 4 and 5.

This lining is screwed upon the nozzle of the force It before molding the cap, and it is then surrounded by the plastic material, as in Fig. 3 during the molding operation.

The periphery of this threaded lining is formed with lugs is, one of which is shown at the left side of Fig. 3 in engagement with the body of plastic material, and such lugs operate to prevent the threaded collar from turning in the cap when screwing it upon or unscrewing it from the outlet-nozzle c.

The mold is charged in the same manner as shown in Fig. 6, to mold the cap with a threaded lining, the force it operating to press the packing material e beneath the ower edge of the lining, thus locking it in permanently in the top of the cap, as shown in Fig. 3.

It is evident from inspection of Fig. 10

that the contents of the receptacle cannot .contact with anything in the cap except the inner surface of the packing e, and such cap may be used to close a receptacle containing any corrosive liquid if the packing e be made of non-corrodible nature.

This cap is formed very cheaply by molding it of plastic material, and when provided with the non-corrosive packing 6 it is more durable than any form of metallic cap which is exposed to corrosion.

It will be observed that the method of manufacture locates the margin of the stopper (which is formed by the platen-plate) exactly at right-angles to the axis of the screw-thread, as it is pressed into such a position by the force and is held thereby while the plastic material is cooled to its permanent form.

This step in the process of manufacture avoids the necessity of any finishing or turning operation to true off the mar inal surface of the platen-plate which orms the stopper when the cap is applied to an outletnozzle.

This method of molding the packin plate into the body of the 'cap completel nishes the article at a single operation an obviates the necessity of testing or truing-up the stopper.

Having thus set forth the nature of the invention what is claimed herein is:

1. A screw-cap for receptacles, the said cap being molded of plastic material with a plate of packing material molded into the top of its socket and the periphery of such plate extended into the material beyond the wall of the socket to lock the plate permanently therein.

2. A screw-cap for receptacles, the said cap being molded of plastic material with a plate of relatively non-corrodible packing material molded into the top of its socket and its periphery locked within the wall 0 the cap, the packing-plate operating to exclude the contents of the receptacle from any contact with the cap.

3. A screw-cap for receptacles, the said. cap being molded of plastic material with a screw-thread therein, and a plate ofpacking material molded into and locked within the material of the cap at the top if its socket and the margin of a plate extending under the bottom of such screw-thread and retained ing-plate to extend into the wall of the socket such charge, and forcing such plate down to hold the plate permanently in place. upon the charge of plastic material, causing 5. The method of molding a screw-cap for the lastic material to flow around the edge 10 receptacles with a packing-plate locked in of tl e plate and lock it in the top of the cap.

5 the topof its socket, which consists in plac- In testimony whereof I have hereunto set ing a suitable charge of plastic material in a my hand. mold, with a plate of packing material upon CHARLES F. BURROUGHS. 

